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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 4个循环 for  for in  while do while

        /* for(初始值;满足的条件;迭代的条件){
            执行语句
        }

        */
        // i++;
        // i=i+1;
        // i+=1
        // for(var i=12;i<=100;i+=2){
        //     document.write("打印了第"+i+"份试卷<br>")
        // }

        // for(var i=1;i<=5;i++){
        //     document.write("跑了"+i*1000+"米<br>")
        // }
        // console.log(i)




    </script>
</body>
</html>